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Sync github production to FB HDFS cheetah branch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| #!/bin/bash | ||
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| # Mount an HDFS uri into a local directory. Start up an instance of the proxy | ||
| # if there isn't one already running. | ||
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| hdfs_uri=$1 | ||
| local_dir=$2 | ||
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| START_PORT=34550 | ||
| END_PORT=34700 | ||
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| # Needs to be root user to restart rpcidmapd. Will sudo as hadoop later | ||
| if [ $UID -ne 0 ]; then | ||
| echo "Error: must run as root user" | ||
| exit 1 | ||
| fi | ||
|
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| # Does hadoop user exist on system? | ||
| if ! /usr/bin/getent passwd hadoop >/dev/null 2>/dev/null; then echo | ||
| echo "Error: hadoop user does not exist on system." | ||
| exit 1 | ||
| fi | ||
|
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| # Find a free port to bind to between the start and end ports | ||
| # Return 0 if nothing was free in that range | ||
| find_free_port() { | ||
| start=$1 | ||
| end=$2 | ||
| port=$start | ||
| while true; do | ||
| free=$(lsof -iTCP:$port | wc -l) | ||
| if [ $free == "0" ]; then | ||
| break | ||
| fi | ||
| port=$(( $port + 1)) | ||
| if [ $port -gt $end ]; then | ||
| port=0 | ||
| break | ||
| fi | ||
| done | ||
| echo $port | ||
| } | ||
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| # Get a port of an existing NFS proxy. If there isn't one, return 0 | ||
| get_existing_port() { | ||
| running_pid=$(/usr/bin/pgrep -f org.apache.hadoop.hdfs.nfs.nfs4.NFS4Server) | ||
| if [ $? != "0" ]; then | ||
| echo "0" | ||
| return | ||
| fi | ||
|
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| if [ $(echo "${running_pid}" | wc -l) != "1" ]; then | ||
| # More than one proxy. What's going on? | ||
| exit 6 | ||
| fi | ||
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| port=$(/bin/awk -F'\0' '{ print $(NF-1) }' /proc/$running_pid/cmdline) | ||
| if ! echo "${port}" | /bin/egrep -q '^[0-9]+$'; then | ||
| # Command line looks weird. What's going on? | ||
| exit 7 | ||
| fi | ||
|
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| echo ${port} | ||
| } | ||
|
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| # Start up an instance of the proxy | ||
| start_proxy() { | ||
| # Pick a free port to run on | ||
| free_port=$(find_free_port $START_PORT $END_PORT) | ||
| if [ $free_port -eq 0 ]; then | ||
| echo "Error: could not find a free port" | ||
| exit 4 | ||
| fi | ||
| $(dirname ${BASH_SOURCE[0]})/start-nfs-server.sh $free_port >/dev/null 2>/dev/null | ||
| sleep 5 | ||
| echo $free_port | ||
| } | ||
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| if [ $# -ne 2 ]; then | ||
| echo "Usage: $0 <hdfs uri> <directory>" | ||
| echo | ||
| echo " Mounts the HDFS location into the local directory" | ||
| echo | ||
| exit 1 | ||
| fi | ||
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| if ! echo $1 | /bin/egrep -q "^hdfs://[^:/]+:[0-9]+/.+$"; then | ||
| echo "Error: HDFS URI '$hdfs_uri' is not valid" | ||
| exit 2 | ||
| fi | ||
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| short_uri=$(echo "${hdfs_uri}" | sed -e 's/^hdfs:\/\/*//' -e 's/^\([^:]*\):\([0-9]*\)/\1.\2/') | ||
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| if [ ! -d "${local_dir}" ]; then | ||
| echo "Error: Directory '${local_dir}' does not exist" | ||
| exit 3 | ||
| fi | ||
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| existing_port=$(get_existing_port) | ||
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| if [ $existing_port == "0" ]; then | ||
| existing_port=$(start_proxy) | ||
| fi | ||
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| /bin/mount -t nfs4 "localhost:/${short_uri}" "${local_dir}" -o rw,intr,port=${existing_port} | ||
|
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| exit $? |
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